Fasciculation (Muscle Twitching) 💡 Fasciculation is simply a muscle twitch. Many people experience it, a flicker in the eyelid, a twitch in the shoulder, or a small muscle that won’t quite settle. Often, this happens due to muscle activity or irritation, especially after an injury. For example, an injury in the forearm can cause nearby muscles to twitch slightly, and that’s completely normal. In most cases, it’s nothing you need to fix or worry about. However, if twitching is accompanied by oth